Which of the following describes a difference between DNA and RNA?
A. RNA molecules consist of a single polynucleotide chain, whereas DNA molecules consist of two polynucleotide chains organized into a double helix.
B. One of their nitrogenous bases is different.
C. They contain different sugars.
D. The first and second choices are correct differences.
E. The first three choices all describe differences.
Ans: E. The first three choices all describe differences.
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With regard to DNA topology, which of the following is not a continuous deformation?
A. conformational changes due to stretching B. conformational changes due to thermal motion C. conformational changes due to interaction with proteins D. conformational changes due to interaction with molecules other than proteins E. conformational changes due to DNA strand breakage
The opening in the front of the eye that is surrounded by the iris and through which light passes is the
A. pupil.
B. retina.
C. sclera.
D. aqueous humor.
E. iris.
Assuming resting conditions at sea level, what is the partial pressure of carbon dioxide in pulmonary veins?
A) 100 mm Hg B) 40 mm Hg C) 80 mm Hg D) 160 mm Hg E) 46 mm Hg
Which observation was most influential to Charles Darwin?
A) the wide variety of living things in South America B) the difference between organisms of South America and organisms of Europe C) the similarity between organisms of South America and organisms of Europe D) the slight differences between organisms on nearby islands